CB360, GS850 pistons, CrazyPJ school me!
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CB360, GS850 pistons, CrazyPJ school me!

This is a discussion on CB360, GS850 pistons, CrazyPJ school me! within the Technical forums, part of the Caferacer.net Forums category; I am very interested in the swap. I love to get stock parts from another bike and use them as high performance parts on others. ...

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  1. #1
    Junior Member tripod808's Avatar
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    CB360, GS850 pistons, CrazyPJ school me!

    I am very interested in the swap. I love to get stock parts from another bike and use them as high performance parts on others. I'm shopping around for GS850 pistons and plan on boring and running them in my CB360. I want increased performance but still want the bike streetable and relaible.

    I understand that this is a pretty straightforward mod but I would still like to gather as much info as possible before undertaking this.

    CrazyPJ, you say you milled .025 off the head to increase compression, what are your thoughts on NOT doing this? Will I be negating any benefits of the larger pistons by not milling? Again, I'm not building a race bike.

    You said you made your own gasket for this mod, do you think I could buy one off you? I've never made a head gasket before.

    On top of this I plan on a port and polish, gonna upgrade my carbs but still have to do more research on my options. Any carb suggestions? Keep in mind I like low budget performance.

    In the future, I may upgrade my cam with one from Megacycle. Do I have other cam options?

    Thanks in advance fellas.

    Not new to wrenching but still have alot to learn..

  2. #2
    Moderator imslow's Avatar
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    .25 ?
    Inertial dynos just make people cranky

  3. #3
    Junior Member tripod808's Avatar
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    quote:Originally posted by imslow

    .25 ?
    Corrected that, thanks for catching it
    Not new to wrenching but still have alot to learn..

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  5. #4
    Senior Member crazypj's Avatar
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    You need to specify how your measuring if your throwing numbers about.
    0.025 means nothing, .25 what? bananas?
    0.025" is a measurement, specifying inches, twenty five thousandths of inch for the numerically challenged
    Get a gasket from Lani at copper gaskets, he's made a few for me since I made my own.
    If you skim head you have to re-time cam, if you don't, you don't.
    You may have trouble finding GS850 pistons, they are discontinued by Suzuki (I checked) nothing much has turned up on eBay in last 8 months.

    PJ
    I dabble in rocket science, when I\'m not picking my nose
    The other night I gave my girlfriend an orgasm, but, she spat it back at me

    'you can take my word for it or argue until you find out I'm right'

  6. #5
    Senior Member Teazer's Avatar
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    Stock CB360 is 67mm IIRC, so you are looking for pistons at say 2mm O/S at 69mm or maybe 3mm at 70mm?

    CB450 is 70mm if it can be bored into those sleeves and if the wrist pin is compatible, that could be a place to start.

    GS750 pistons in 69mm bore (2mm O/S) are available from Wiseco if their crowns are the right shape.

    If you slip in cams with more lift and duration, you will probably want more compression to compensate for the loss in low end performance. And then you will want a set of 32mm VM Mikuni carbs or something more racey and costs start to fly out the window pretty fast.

    Maybe a slightly higher compression with stock pistons and cam may be a more cost effective option.

    At least a 360 has a much better 6 speed than those poor people with CB350s.

  7. #6
    Senior Member crazypj's Avatar
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    Wiseco's are HEAVY pistons.
    They would probably work OK as long as stock cam and lowish rpm was used or, fit Carrillo rods
    GS pistons are lighter than stock Honda so crank survives quite happily at 12,000 rpm (cam bearings are different matter though )
    You don't want 32's on a street motor and I'm pretty sure most people running them on 'race' motors would be happier with 30's if they set the up properly. (they are easier to set up than 32's)
    I dabble in rocket science, when I\'m not picking my nose
    The other night I gave my girlfriend an orgasm, but, she spat it back at me

    'you can take my word for it or argue until you find out I'm right'

  8. #7
    Junior Member tripod808's Avatar
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    quote:Originally posted by crazypj

    You need to specify how your measuring if your throwing numbers about.
    0.025 means nothing, .25 what? bananas?
    0.025" is a measurement, specifying inches, twenty five thousandths of inch for the numerically challenged
    Get a gasket from Lani at copper gaskets, he's made a few for me since I made my own.
    If you skim head you have to re-time cam, if you don't, you don't.
    You may have trouble finding GS850 pistons, they are discontinued by Suzuki (I checked) nothing much has turned up on eBay in last 8 months.

    PJ
    I'll contact Lani at copper gaskets for my needs. Thanks for the tips.

    I've been looking on ebay for those pistons for a month now, I was suprised at how uncommon they are. When they do show up on ebay, whatdo you think is a fair price to pay for a set?
    Not new to wrenching but still have alot to learn..

  9. #8
    Senior Member crazypj's Avatar
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    I was looking for longer than a month and bought the first (only) set I saw.
    If you see any, just buy them.
    Still going to be cheaper than custom pistons (at least $700.00 a set of four)

    PJ
    I dabble in rocket science, when I\'m not picking my nose
    The other night I gave my girlfriend an orgasm, but, she spat it back at me

    'you can take my word for it or argue until you find out I'm right'

  10. #9
    Junior Member tripod808's Avatar
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    So I just pushed the "Buy it now" button on ebay and purchased a set of GS850 pistons.. We'll see how badly this project snowballs from here..
    Not new to wrenching but still have alot to learn..

  11. #10
    Senior Member roccitycafe's Avatar
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    bike bandit appears to have them new, wrist pins and ring sets as well...

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